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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '526e90de82a657ef0478eb5d703e55cc92e99aeceae31405016e44c340be24a9' 
  AND token = 'dDzGJJub5zBSmmumM++7cbEQmv9ImA6H6v5Guw8w328=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}